香炉碗子金矿床成矿物质来源及矿床成因探讨

STUDY ON SOURCES OF METALLOGENIC ELEMENTS & ORE DEPOSIT GENESIS IN XIANGLUWANZI GOLD DEPOSIT

通过对香炉碗子金矿床巾稀土元素特征及流、铅、氢、氧同位素地球化学研究表明．矿床中矿石与主要赋矿围岩次火山隐保角砾岩、霏细岩、变辉绿者的稀土元素配分模式和特征值相近，围岩提供了成矿物质来源；矿石流同位素组成显示出破主要来自深源岩浆源；矿石钦同位素组成显示出铅来源单一，来自上地幔或下地壳；氢氧同位素组成旦示出成矿流体际岩浆水外，还有大气降水加入，成矿与燕山期次火山活动密切相关，成因应届浅成次火山热浪型金矿床。

The study on geochemistry of the rare earth elements(REE) and the isotopes of sulfur, lead, hydrogen and oxygen in the gold deposit showed that the distributions of REE of the subvolcanic crypoexplosive breccia, felsite and metadiabase in the ore and in the country rock were similar in their characteristic values. The country rock provided mineralization with material source. The composition of the isotopes sulfur in the ores demonstrated that the sulfur was mainly derived from deep - seated magmatic source. The composition of the isotope lead in the ores showed that the lead was uniquely derived from upper earth's mantle or lower earth ' s crust and the composition of the isotopes hydrogen and oxygen indicated that there was atmospheric water joining into the mineralizing fluid besides magmatic water. As a result, the mineralization has a close relation with subvolcanic activities of Yanshan period. The gold deposit belongs to hypabyssal secondary volcanic hydrothemal type.